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An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when the blood is pumped. An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly.
There are various types of irregular heart rhythm with characteristic electrocardiogram (ECG) patterns. A heart attack (myocardial infarction) and if it was recent or some time ago. A heart attack causes damage to heart muscle and it heals with scar tissue. These can be detected by abnormal ECG patterns. An enlarged heart.